app/internal/srgb: move sRGB emulation to new internal package

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/headless/headless.go

@@ -9,6 +9,8 @@ import (
 	"image"
 	"runtime"
 
+	"gioui.org/app/internal/glimpl"
+	"gioui.org/app/internal/srgb"
 	"gioui.org/gpu"
 	"gioui.org/gpu/gl"
 	"gioui.org/op"
@@ -18,12 +20,12 @@ import (
 type Window struct {
 	size image.Point
 	ctx  context
-	fbo  *gl.SRGBFBO
+	fbo  *srgb.SRGBFBO
 	gpu  *gpu.GPU
 }
 
 type context interface {
-	Functions() gl.Functions
+	Functions() *glimpl.Functions
 	MakeCurrent() error
 	ReleaseCurrent()
 	Release()
@@ -41,7 +43,7 @@ func NewWindow(width, height int) (*Window, error) {
 	}
 	err = contextDo(ctx, func() error {
 		f := ctx.Functions()
-		fbo, err := gl.NewSRGBFBO(f)
+		fbo, err := srgb.NewSRGBFBO(f)
 		if err != nil {
 			ctx.Release()
 			return err

app/headless/headless_darwin.go

@@ -4,7 +4,6 @@ package headless
 
 import (
 	"gioui.org/app/internal/glimpl"
-	"gioui.org/gpu/gl"
 )
 
 /*
@@ -16,7 +15,7 @@ import (
 import "C"
 
 type nsContext struct {
-	c        gl.Functions
+	c        *glimpl.Functions
 	ctx      C.CFTypeRef
 	prepared bool
 }
@@ -39,7 +38,7 @@ func (c *nsContext) ReleaseCurrent() {
 	C.gio_headless_clearCurrentContext(c.ctx)
 }
 
-func (c *nsContext) Functions() gl.Functions {
+func (c *nsContext) Functions() *glimpl.Functions {
 	return c.c
 }
 

app/headless/headless_js.go

@@ -7,12 +7,11 @@ import (
 	"syscall/js"
 
 	"gioui.org/app/internal/glimpl"
-	"gioui.org/gpu/gl"
 )
 
 type jsContext struct {
 	ctx js.Value
-	f   gl.Functions
+	f   *glimpl.Functions
 }
 
 func newContext() (*jsContext, error) {
@@ -38,7 +37,7 @@ func newContext() (*jsContext, error) {
 	return c, nil
 }
 
-func (c *jsContext) Functions() gl.Functions {
+func (c *jsContext) Functions() *glimpl.Functions {
 	return c.f
 }